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https://github.com/paboyle/Grid.git
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91 lines
2.4 KiB
Plaintext
91 lines
2.4 KiB
Plaintext
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Branch: develop
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Files:
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Grid/lattice/PaddedCell.h -- Halo exchange
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tests/Test_general_stencil.cc -- test local off axis stencil addressing
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tests/debug/Test_padded_cell.cc -- test PaddedCell halo exchange and the General local stencil by computing ALL plaquettes on lattice
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Functionality:
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-- extend a lattice field:
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Grid/lattice/PaddedCell.h
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// Constructor
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PaddedCell(int _depth,GridCartesian *_grid)
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// Expand a field "in" to depth "d"
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template<class vobj>
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inline Lattice<vobj> Exchange(Lattice<vobj> &in)
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// Take the "apple core" of in to a smaller local volume
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template<class vobj>
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inline Lattice<vobj> Extract(Lattice<vobj> &in)
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-- Plaquette test:
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tests/debug/Test_padded_cell.cc
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/////////////////////////////////////////////////
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// Create a padded cell of extra padding depth=1
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/////////////////////////////////////////////////
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int depth = 1;
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PaddedCell Ghost(depth,&GRID);
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LatticeGaugeField Ughost = Ghost.Exchange(Umu);
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///// Array for the site plaquette
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GridBase *GhostGrid = Ughost.Grid();
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LatticeComplex gplaq(GhostGrid);
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std::vector<Coordinate> shifts;
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for(int mu=0;mu<Nd;mu++){
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for(int nu=mu+1;nu<Nd;nu++){
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// Umu(x) Unu(x+mu) Umu^dag(x+nu) Unu^dag(x)
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Coordinate shift_0(Nd,0);
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Coordinate shift_mu(Nd,0); shift_mu[mu]=1;
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Coordinate shift_nu(Nd,0); shift_nu[nu]=1;
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shifts.push_back(shift_0);
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shifts.push_back(shift_mu);
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shifts.push_back(shift_nu);
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shifts.push_back(shift_0);
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}
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}
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GeneralLocalStencil gStencil(GhostGrid,shifts);
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gplaq=Zero();
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{
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autoView( gp_v , gplaq, CpuWrite);
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autoView( t_v , trplaq, CpuRead);
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autoView( U_v , Ughost, CpuRead);
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for(int ss=0;ss<gp_v.size();ss++){
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int s=0;
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for(int mu=0;mu<Nd;mu++){
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for(int nu=mu+1;nu<Nd;nu++){
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auto SE0 = gStencil.GetEntry(s+0,ss);
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auto SE1 = gStencil.GetEntry(s+1,ss);
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auto SE2 = gStencil.GetEntry(s+2,ss);
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auto SE3 = gStencil.GetEntry(s+3,ss);
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int o0 = SE0->_offset;
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int o1 = SE1->_offset;
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int o2 = SE2->_offset;
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int o3 = SE3->_offset;
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auto U0 = U_v[o0](mu);
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auto U1 = U_v[o1](nu);
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auto U2 = adj(U_v[o2](mu));
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auto U3 = adj(U_v[o3](nu));
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gpermute(U0,SE0->_permute);
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gpermute(U1,SE1->_permute);
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gpermute(U2,SE2->_permute);
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gpermute(U3,SE3->_permute);
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gp_v[ss]() =gp_v[ss]() + trace( U0*U1*U2*U3 );
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s=s+4;
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}
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}
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}
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}
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cplaq = Ghost.Extract(gplaq);
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